Abstract: The signal output circuit 1 includes a first and a second emitter follower circuit, and a comparator 20. The comparator 20 receives output signals from the first and the second emitter follower circuit, and outputs a result of comparison in magnitude between those signals. The comparator 20 includes a transistor T5 (fifth transistor), a transistor T6 (sixth transistor), a resistance element R3, and a current mirror circuit 30. The resistance element R3 connects the emitters of the transistor T5 and of the transistor T6. To the collectors of the transistor T5 and the transistor T6, the current mirror circuit 30 is connected.

Abstract: The signal output circuit 1 includes a first and a second emitter follower circuit, and a comparator 20. The comparator 20 receives output signals from the first and the second emitter follower circuit, and outputs a result of comparison in magnitude between those signals. The comparator 20 includes a transistor T5 (fifth transistor), a transistor T6 (sixth transistor), a resistance element R3, and a current mirror circuit 30. The resistance element R3 connects the emitters of the transistor T5 and of the transistor T6. To the collectors of the transistor T5 and the transistor T6, the current mirror circuit 30 is connected.